Heat dissipation device and illumination device using same

Abstract

An exemplary heat dissipation device includes an elongated main body, a number of heat sinks, and a number of airflow channels. The main body has a central axis, and includes a first portion and a second portion. The second portion has an end distant from the first portion which is configured for supporting at least one item selected from the group consisting of a solid-state light source and a circuit board having a solid-state light source mounted thereon. The heat sinks are arranged around the first portion in sequence along the central axis of the main body, and spaced from one another. Each heat sink includes a number of fins extending out from the first portion radially. The airflow channel is defined between each two neighboring heat sinks.

1 . An illumination device, comprising:
 a heat dissipation device comprising:
 an elongated main body having a central axis and comprising a first portion and a second portion located in sequence along the central axis, 
 a plurality of heat sinks arranged around the first portion in sequence along the central axis of the main body and spaced from one another, each of the heat sinks comprising a plurality of fins extending out from the first portion radially, and 
 an airflow channel defined between each two neighboring heat sinks; and 
   at least one solid-state light source provided at an end of the second portion distant from the first portion.   
     
     
         2 . The illumination device of  claim 1 , wherein the number of fins of each heat sink is same as the number of fins of each other heat sink, and each fin of each heat sink is aligned with a corresponding fin of a neighboring heat sink along a direction parallel to the central axis of the main body. 
     
     
         3 . The illumination device of  claim 1 , wherein the first portion of the main body is cylindrical. 
     
     
         4 . The illumination device of  claim 1 , wherein the second portion of the main body is frustoconical, with the second portion tapering from the end distant from the first portion to an end of the second portion which is adjacent to the first portion, and a diameter of the end of the second portion distant from the first portion is larger than a diameter of the first portion. 
     
     
         5 . The illumination device of  claim 1 , wherein the second portion of the main body comprises a first section extending up from the first portion and a second section distant from the first portion, and the at least one solid-state light source is arranged at the second section. 
     
     
         6 . The illumination device of  claim 5 , wherein the second section has an end surface distant from the first section and a plurality of substantially planar side surfaces adjacent to and surrounding the end surface, and the at least one solid-state light source comprises a plurality of solid-state light sources arranged at the end surface and the side surfaces. 
     
     
         7 . The illumination device of  claim 6 , wherein an angle between the end surface and each side surface is an obtuse angle. 
     
     
         8 . The illumination device of  claim 6 , wherein the second section of the second portion has one of a substantially circular frustoconical shape and a substantially polygonal frustoconical shape, and each such shape tapers from an end thereof adjacent to the first section to an end thereof distant from the first section. 
     
     
         9 . The illumination device of  claim 8 , wherein the second section of the second portion has a substantially polygonal frustoconical shape, and a diameter of the end of the second section adjacent to the first section is larger than a diameter of the first section. 
     
     
         10 . The illumination device of  claim 1 , wherein each heat sink further comprises a sleeve contacting the first portion of the main body, and the fins of the heat sink extend out from the sleeve. 
     
     
         11 . The illumination device of  claim 1 , wherein the heat dissipation device is made of material selected from the group consisting of aluminum, copper, and aluminum-copper alloy. 
     
     
         12 . The illumination device of  claim 1 , wherein the at least one solid-state light source comprises at least one light emitting diode. 
     
     
         13 . The illumination device of  claim 1 , wherein the at least one solid-state light source is mounted on a circuit board, and the circuit board is provided at the end of the second portion distant from the first portion. 
     
     
         14 . A heat dissipation device, comprising:
 an elongated main body having a central axis and comprising a first portion and a second portion, the second portion having an end distant from the first portion which is configured for supporting at least one item selected from the group consisting of a solid-state light source and a circuit board having a solid-state light source mounted thereon;   a plurality of heat sinks arranged around the first portion in sequence along the central axis of the main body and spaced from one another, each heat sink comprising a plurality of fins extending out from the first portion radially; and   an airflow channels defined between each two neighboring heat sinks.   
     
     
         15 . The heat dissipation device of  claim 14 , wherein each heat sink further comprises a sleeve contacting the first portion of the main body, and the fins of the heat sink extend out from the sleeve. 
     
     
         16 . The heat dissipation device of  claim 14 , wherein the heat dissipation device is made of material selected from the group consisting of aluminum, copper, and aluminum-copper alloy. 
     
     
         17 . The heat dissipation device of  claim 14 , wherein the number of fins of each heat sink is the same as the number of fins of each other heat sink, and each fin of each heat sink is aligned with a corresponding fin of a neighboring heat sink along a direction parallel to the central axis of the main body. 
     
     
         18 . The heat dissipation device of  claim 14 , wherein the second portion of the main body is frustoconical, with the second portion is tapering from the end distant from the first portion to an end of the second portion which is adjacent to the first portion, and a diameter of the end of the second portion distant from the first portion is larger than a diameter of the first portion. 
     
     
         19 . The heat dissipation device of  claim 14 , wherein the second portion of the main body comprises a first section extending up from the first portion and a second section distant from the first portion, and the at least one solid-state light source is arranged at the second section. 
     
     
         20 . The heat dissipation device of  claim 19 , wherein the second section has an end surface distant from the first section and a plurality of substantially planar side surfaces adjacent to and surrounding the end surface, and the at least one solid-state light source comprises a plurality of solid-state light sources arranged at the end surface and the side surfaces.